I'm not entirely sure if this is XP related, but I'm not sure what else it
could be, but, when I start up my computer, it'll take about 5 minutes to
start up, it will come on, and just before the windows XP screen appears, the
screen goes black, I either have to continuously retsart until it starts up
properly, or leave it for about 15 minutes, then start it up again.

I originally thought this was a power problem, but I tried my mates power
supply in my computer and the same thing happened, so any help would be
appreciated.

Cheers
Dave